I have never used one but know someone who has. He claims it is great but you cant put a TON of stuff in it. My compost pile has so much yard debris in it I would have to use two piles. One for bulk and one for household stuff.
maybe someone else has first hand experience with them.
My grandmother uses one and she swears by it. She also lives where coyotes and racoons are a problem. She likes that it is tidy, too, and doesn't make her yard look or smell gross. She's a very neat kind of person.